Post-translational maturation of IDA, a peptide signal controlling floral organ abscission in Arabidopsis.

Autor: Stührwohldt, Nils, Hohl, Mathias, Schardon, Katharina, Stintzi, Annick, Schaller, Andreas
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Zdroj: Communicative & Integrative Biology; 2018, Vol. 11 Issue 1, pN.PAG-N.PAG, 1p
Abstrakt: The abscission of sepals, petals and stamens in Arabidopsis flowers is controlled by a peptide signal called IDA (Inflorescence Deficient in Abscission). IDA belongs to the large group of small post-translationally modified signaling peptides that are synthesized as larger precursors and require proteolytic processing and specific side chain modifications for signal biogenesis. Using tissue-specific expression of proteinase inhibitors as a novel approach for loss-of-function analysis, we recently identified the peptidases responsible for IDA maturation within the large family of subtilisin-like proteinases (subtilases; SBTs). Further biochemical and physiological assays identified three SBTs (AtSBT5.2, AtSBT4.12, AtSBT4.13) that cleave the IDA precursor to generate the N-terminus of the mature peptide. The C-terminal processing enzyme(s) remain(s) to be identified. While proline hydroxylation was suggested as additional post-translational modification required for IDA maturation, hydroxylated and non-hydroxylated IDA peptides were found to be equally active in bioassays for abscission. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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